<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div class="parent">
        <div class="test"></div>
      </div>
</body>
</html>
<script>
    
</script>
<style>
    .parent {
        border: 2px solid #333;
        width: 100px;
        height: 100px;
      }
    /* .test {
          width: 40px;
          height: 40px;
          background-color: pink;
          margin: 30px auto;
     } */
     /* .test {
          width: 40px;
          height: 40px;
          background-color: pink;
          position: absolute;
          top: 38px;
          left: 38px;
     } */
     .test {
          width: 40px;
          height: 40px;
          background-color: pink;
          position: relative;
          top: 30px;
          left: 30px;
     }
</style>